Granular Magnesium Sulfate (typically as MgSO₄·7H₂O or MgSO₄·H₂O) offers the essential benefits of magnesium and sulfur in a convenient, free‑flowing granule designed for dry soil application and custom blending. With magnesium content ranging from 9.8% to 17% and sulfur from 13% to 22% depending on the hydrate form, our premium granules provide a controlled, slow‑release nutrient supply that matches crop uptake, reduces leaching, and simplifies field operations. For growers seeking a practical, cost‑effective way to build soil magnesium reserves and improve crop quality, granular magnesium sulfate is the ideal choice.

I. Why Granular Form Matters

Superior Handling and Application
Our granules are manufactured in uniform sizes ranging from 1–4 mm (with options for 2–4 mm, 1–3 mm, and 3–5 mm), ensuring consistent flow through all types of broadcast spreaders, air seeders, and fertilizer blending equipment. The uniform size eliminates segregation during blending with other granular products (MAP, DAP, potash, urea) and guarantees an even distribution pattern across the field. The granules are free‑flowing, dust‑free, and resist caking during storage.

Ideal for Custom Blending
Because the granules are close in density to other common fertilizer materials, they remain well‑mixed and do not stratify during transport. This makes granular magnesium sulfate the preferred source of magnesium and sulfur in bulk blends for custom applicators and large‑scale farming operations.

Slow‑Release, Low‑Leaching Nutrition
Unlike highly soluble powdered or crystalline forms, granular magnesium sulfate dissolves gradually with soil moisture, releasing magnesium and sulfur over an extended period. This slow‑release pattern better matches ongoing plant demand, significantly reducing the risk of nutrient loss through leaching in sandy or high‑rainfall areas, and improving overall fertilizer use efficiency.

Reduced Application Frequency
The controlled release of granular magnesium sulfate provides a longer residual effect in the soil, reducing the need for frequent applications. A single application can supply adequate magnesium and sulfur for an entire growing season or longer, saving time, labor, and application costs.

II. Core Agronomic Benefits

Essential Magnesium for Chlorophyll and Photosynthesis
Magnesium is the central atom of the chlorophyll molecule. Without adequate magnesium, chlorophyll synthesis stops, and photosynthesis grinds to a halt. Magnesium also activates more than 300 enzymes involved in energy transfer, carbohydrate metabolism, and protein synthesis.

Essential Sulfur for Protein and Oil Synthesis
The sulfate component provides sulfur in the plant‑available form. Sulfur is a component of the amino acids methionine and cysteine, essential for protein synthesis. It is also critical for oil formation in oilseed crops (canola, sunflower) and the development of flavour compounds in onions, garlic, and cruciferous vegetables.

Chloride‑Free and Low Salt Index
Granular magnesium sulfate contains no chloride, making it safe for chloride‑sensitive crops including tobacco, potatoes, citrus, and berries. Its low salt index reduces the risk of root or seed injury when placed near the row.

Soil Health Improvement
Magnesium and sulfur are both essential for maintaining soil fertility. Magnesium helps improve soil structure by promoting aggregation of clay particles, while sulfur contributes to the formation of humus and supports beneficial microbial activity.

III. Application Guidelines

Soil Application – Broadcast or Band

• Rate: 100–300 kg per hectare, depending on soil test results and crop requirements.
  • General maintenance: 100–150 kg/ha/year.
  • Moderate deficiency: 200–250 kg/ha.
  • Severe deficiency: 300–400 kg/ha.
• Timing: Apply pre‑plant and incorporate into the root zone, or apply as a top‑dress during early growth.
• Best practice: On sandy soils, split applications (2–3 times per season) reduce leaching risk.

Blending with NPK Fertilizers
Granular magnesium sulfate is highly compatible with most dry granular fertilizers, including urea, DAP, MAP, potash, and ammonium sulfate. It can be blended to create custom magnesium‑ and sulfur‑fortified NPK formulations.

Pasture and Forage

• Rate: 150–250 kg per hectare in early spring and after each cutting.
• Benefit: Increases crude protein, dry matter yield, and prevents grass tetany (magnesium deficiency in livestock).

Crop‑Specific Recommendations

Potatoes
Apply 200–300 kg/ha pre‑plant incorporated. Magnesium improves tuber specific gravity; sulfur reduces internal brown spot. Yield increase of 10–20% common.

Cereals (Wheat, Corn, Rice)
Apply 150–200 kg/ha in the seedbed or as a starter band. Enhances stalk strength, reduces lodging, improves grain test weight.

Fruit Trees (Citrus, Apple, Stone Fruits)
Broadcast 150–300 g per square meter under the canopy, or 200–500 g per tree depending on size. Prevents pre‑harvest leaf drop, improves fruit size and colour.

Vegetables (Tomatoes, Peppers, Cucumbers)
Apply 150–250 kg/ha pre‑plant or as a side‑dress during active growth. Improves fruit set, reduces blossom‑end rot (in combination with calcium), and enhances shelf life.

Oilseeds (Canola, Sunflower)
Apply 150–250 kg/ha at planting or as a side‑dress. Sulfur critical for oil synthesis; magnesium improves seed fill. Oil content increase of 3–6%.

IV. Technical Specifications (Granular, Agricultural Grade)

Chemical Properties (Heptahydrate Form)

• Formula: MgSO₄·7H₂O
• Magnesium (Mg): 9.8% minimum
• Sulfur (S): 13.0% minimum (as SO₄)
• Purity: ≥ 99.0%

Chemical Properties (Monohydrate Form – Higher Concentration)

• Formula: MgSO₄·H₂O
• Magnesium (Mg): 17.0% minimum
• Sulfur (S): 22.0% minimum (as SO₄)
• Purity: ≥ 99.0%

Physical Properties

• Appearance: White to off‑white, free‑flowing granules
• Granule size: 1–4 mm (standard), 2–4 mm, 3–5 mm options available
• Bulk density: 1000–1200 kg/m³
• Hardness: High – resists breakage during handling and blending
• Moisture: ≤ 0.5%

Quality Standards

• Heavy metals: Cd ≤ 1 ppm, Pb ≤ 5 ppm, As ≤ 1 ppm
• Insoluble matter: ≤ 0.05%

V. Environmental and Safety Profile

Soil and Water
Granular magnesium sulfate releases nutrients gradually, matching plant demand and reducing runoff and leaching. Magnesium and sulfur are essential plant nutrients; at recommended rates, they pose minimal environmental risk.

Worker Safety
Granular magnesium sulfate is not classified as hazardous. However, wear gloves and a dust mask when handling large volumes to avoid mechanical irritation from dust. In case of eye contact, flush with water. If swallowed, drink water.

Storage
Store in a dry, covered area. Granular magnesium sulfate is non‑hygroscopic and does not cake, even after extended storage. Shelf life: 36 months.

VI. Quality Assurance and Certifications

Our granular magnesium sulfate is produced in ISO 9001:2015 and ISO 14001:2015 certified facilities. Each batch is tested for nutrient content, granule size distribution, hardness, heavy metals, and solubility. Certificates of Analysis accompany every shipment.

VII. Why Choose Our Granular Magnesium Sulfate

• Superior physical properties – Uniform granules, low dust, high hardness, ideal for blending and spreading.
• Slow‑release nutrition – Gradual dissolution matches crop uptake, reduces leaching.
• High purity – Low heavy metals, chloride‑free, safe for all crops.
• Application flexibility – Suitable for broadcast, banding, blending, and top‑dressing.
• Technical support – Our agronomists help with soil test interpretation, rate calculation, and custom blend design.
• Flexible packaging – 25 kg bags, 50 kg woven sacks, 1‑ton FIBC bulk bags, bulk containers.
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